The meteor exploded Friday in the air near Chelyabinsk, leaving behind nothing but meteorites, thousands of broken windows and some pretty spectacular video of it streaking across the sky before exploding in a noisy, luminous fireball.

The explosion startled residents going about their morning business and damaged more than 4,700buildings, mostly apartments. About 3,500 had been repaired as of Monday, the state-run RIA Novosti news service reported.

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Witness: Meteor explosion 'terrifying'

Meteor explodes over Russia – A large chunk of a meteor that exploded over Russia is found in a lake on Friday, February 15.

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Photos: Meteor explodes over Russia8 photos

Meteor explodes over Russia – A meteor streaks through the sky before exploding with a flash and boom that shattered glass in buildings and left hundreds of people hurt.

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Photos: Meteor explodes over Russia8 photos

Meteor explodes over Russia – Workers repair a damaged power line near the wall of a local zinc plant. About 270 buildings were damaged -- mostly broken glass -- by shock waves caused by the blast, said Vladimir Stepanov of the National Center for Emergency Situations at the Russian Interior Ministry.

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Photos: Meteor explodes over Russia8 photos

Meteor explodes over Russia – The meteor leaves a white streak through the sky. The national space agency, Roscosmos, said scientists believed one meteoroid had entered the atmosphere, where it burned and disintegrated into fragments, according to RIA Novosti.

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Photos: Meteor explodes over Russia8 photos

Meteor explodes over Russia – The meteor's vapor trail passes over the city.

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Meteor explodes over Russia – A man removes shards of glass from the frame of a broken window.

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Meteor explodes over Russia – The meteor damaged windows at a sports hall.

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Meteor explodes over Russia – By noon Russia time more than 725 people had sought medical help.

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EXPAND GALLERY

About 1,000 people suffered injuries, mostly from flying glass. One woman was flown to Moscow for treatment of a spinal injury, state media reported.

State officials said 19 people remained hospitalized Monday, RIA Novosti reported.

Local officials have estimated the damage at more than 1 billion rubles ($33.2 million), RIA Novosti said. The state applied for 500 million rubles in aid from the federal government to help make repairs, the news service reported.

Chelyabinsk Gov. Mikhail Yurevich promised compensation to all those affected, the official Itar-Tass news agency said.

Police are also monitoring online auction sites and social media after reports of people trying to sell what they claim to be meteorites from Friday's explosion, RIA Novosti said. Some of the sellers are asking as much as $4,000 each, state-run RT television reported.

The U.S. space agency, NASA, said the meteor released nearly 500 kilotons of energy, about 33 times more than the nuclear bomb the United States dropped on Hiroshima, Japan, in 1945.

NASA estimated the meteor's diameter at 55 feet (17 meters) and said it was the largest reported since 1908, when a meteor exploded over Tunguska in remote Siberia, destroying 80 million trees over an area of 820 square miles.

"We would expect an event of this magnitude to occur once every 100 years on average," Paul Chodas of NASA's Near-Earth Object Program Office at the Jet Propulsion Laboratory said last week.

"When you have a fireball of this size, we would expect a large number of meteorites to reach the surface, and in this case there were probably some large ones."

The event was unrelated to the passage of another, larger asteroid some 17,100 miles from earth on Friday, according to scientists.